Question: A steam engine is to have its thermal efficiency improved from 8.00% to 10.0% while continuing to pro-duce 4500 J of useful work each cycle.

A steam engine is to have its thermal efficiency improved from 8.00% to 10.0% while continuing to pro-duce 4500 J of useful work each cycle.
(a) Does the ratio of the heat output to heat input (1) increase, (2) remain the same, or (3) decrease? Why?
(b) What is the change in Qc/Qh in this example?

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a To increase the efficiency we should waste a smaller fraction of the heat input ... View full answer

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